This is a new thread that started from a discussion here: https://www.hearth.com/talk/threads/service-provider-recommendations-se-pa.102963/ I recently purchased a home that utilizes a Tarm Solo Plus for its main heat with geothermal and oil back-up. When I bought the house, the prior owner (who is out of the country and impossible to get a hold of) had the wood boiler running already....he explained to me how to start it up, and use it, and I took notes along the way. I wasn't living in the house when I first bought it, but I would stop by 2 times a day to load up with wood - all was well and it was working great. About a month ago, I had to go out of town and the unit cooled down and switched back to oil. That was fine for me because I didnt move in until a few weeks ago, and I kept the temperature way down. I followed the directions he gave me, and got a fire going. I closed the door to the unit and went on my way. The next morning I noticed it was still going but was just kind of stewing and the fire didn't burn off. When I would open the door, the fire would take off. I thought it was odd. That evening I checked again, same thing - same load. The next morning I found a copy of the user manual online (should have done that first!) and I realized that the prior owner neglected to tell me a step - which was to hit the reset button before starting the fire so that the fan would operate. I didn't notice that the fan was not going on and off when I started my own fire. I pulled all of the old logs and stuff out of the firebox and noticed a tar substance along the bottom of the unit. I cleaned up as much as I could but I know there is still a bit of a mess in there. I hit the reset button and started over. Well this time (after calling the manufacturer to walk me through again how it was all supposed to work) I let a nice kindling fire burn and let the flue temperature raise up to where it was supposed to go (I hadn't realized the importance of the flue temperature in the entire process and I think I opened the damper and loaded my heavier wood too early). Once the flue got up to temperature, I loaded the wood into the firebox and closed the door. Fan was running. Almost immediately the flue temperature crashed and the fire died down significantly. Once I would open the door, the fire would get going again and the flue temperature would rise. I'd close the door, and then the same thing would happen. After doing this a few times, the boiler eventually overheated and the thermostats would not call for the heat....this caused for pressure to build in the system and the relief valve to go off. The pressure eventually went back down, but it was a stressful night. Needless to say, my confidence in getting this running without somebody really checking out the unit is waning. I could really use some help. I have a feeling I mucked everything up when i let that fire stew inside the firebox, and that tar perhaps clogged up some of the vents that allow for drafting when the door is closed..but having zero experience, I dont even know where to begin! Any help appreciated! P.S. - No storage currently - but planning on it if I can get this thing running!